<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

/**
 * ThinkPHP内置的Dispatcher类 用于精简模式
 * 完成URL解析、路由和调度
 * @category   Think
 * @package  Think
 * @subpackage  Util
 * @author    liu21st <liu21st@gmail.com>
 * @version   $Id: Dispatcher.class.php 2702 2012-02-02 12:35:01Z liu21st $
 */
class Dispatcher {

	/**
	 * URL映射到控制器
	 * @access public
	 * @return void
	 */
	static public function dispatch() {
		$urlMode  =  C('URL_MODEL');
		if($urlMode == URL_COMPAT || !empty($_GET[C('VAR_PATHINFO')])){
			// 兼容模式判断
			define('PHP_FILE',_PHP_FILE_.'?'.C('VAR_PATHINFO').'=');
			$_SERVER['PATH_INFO']   = $_GET[C('VAR_PATHINFO')];
			unset($_GET[C('VAR_PATHINFO')]);
		}elseif($urlMode == URL_REWRITE ) {
			//当前项目地址
			$url    =   dirname(_PHP_FILE_);
			if($url == '/' || $url == '\\')
			$url    =   '';
			define('PHP_FILE',$url);
		}else {
			//当前项目地址
			define('PHP_FILE',_PHP_FILE_);
		}

		// 分析PATHINFO信息
		tag('path_info');
		// 分析PATHINFO信息
		$depr = C('URL_PATHINFO_DEPR');
		if(!empty($_SERVER['PATH_INFO'])) {
			if(C('URL_HTML_SUFFIX') && !empty($_SERVER['PATH_INFO'])) {
				$_SERVER['PATH_INFO'] = preg_replace('/\.'.trim(C('URL_HTML_SUFFIX'),'.').'$/', '', $_SERVER['PATH_INFO']);
			}
			if(!self::routerCheck()){   // 检测路由规则 如果没有则按默认规则调度URL
				$paths = explode($depr,trim($_SERVER['PATH_INFO'],'/'));
				$var  =  array();
				if (C('APP_GROUP_LIST') && !isset($_GET[C('VAR_GROUP')])){
					$var[C('VAR_GROUP')] = in_array(strtolower($paths[0]),explode(',',strtolower(C('APP_GROUP_LIST'))))? array_shift($paths) : '';
				}
				if(!isset($_GET[C('VAR_MODULE')])) {// 还没有定义模块名称
					$var[C('VAR_MODULE')]  =   array_shift($paths);
				}
				$var[C('VAR_ACTION')]  =   array_shift($paths);
				// 解析剩余的URL参数
				$res = preg_replace('@(\w+)'.$depr.'([^'.$depr.'\/]+)@e', '$var[\'\\1\']="\\2";', implode($depr,$paths));
				$_GET   =  array_merge($var,$_GET);
			}
		}

		// 获取分组 模块和操作名称
		if (C('APP_GROUP_LIST')) {
			define('GROUP_NAME', self::getGroup(C('VAR_GROUP')));
		}
		define('MODULE_NAME',self::getModule(C('VAR_MODULE')));
		define('ACTION_NAME',self::getAction(C('VAR_ACTION')));
		// URL常量
		define('__SELF__',$_SERVER['REQUEST_URI']);
		// 当前项目地址
		define('__APP__',PHP_FILE);
		// 当前模块和分组地址
		$module = defined('P_MODULE_NAME')?P_MODULE_NAME:MODULE_NAME;
		if(defined('GROUP_NAME')) {
			$group   = C('URL_CASE_INSENSITIVE') ?strtolower(GROUP_NAME):GROUP_NAME;
			define('__GROUP__', GROUP_NAME == C('DEFAULT_GROUP') ?__APP__ : __APP__.'/'.$group);
			define('__URL__', __GROUP__.$depr.$module);
		}else{
			define('__URL__',__APP__.'/'.$module);
		}
		// 当前操作地址
		define('__ACTION__',__URL__.$depr.ACTION_NAME);
		//保证$_REQUEST正常取值
		$_REQUEST = array_merge($_POST,$_GET);
	}

	/**
	 * 路由检测
	 * @access public
	 * @return void
	 */
	static public function routerCheck() {
		$return   =  false;
		// 路由检测标签
		tag('route_check',$return);
		return $return;
	}

	/**
	 * 获得实际的模块名称
	 * @access private
	 * @return string
	 */
	static private function getModule($var) {
		$module = (!empty($_GET[$var])? $_GET[$var]:C('DEFAULT_MODULE'));
		unset($_GET[$var]);
		if(C('URL_CASE_INSENSITIVE')) {
			// URL地址不区分大小写
			define('P_MODULE_NAME',strtolower($module));
			// 智能识别方式 index.php/user_type/index/ 识别到 UserTypeAction 模块
			$module = ucfirst(parse_name(P_MODULE_NAME,1));
		}
		return $module;
	}

	/**
	 * 获得实际的操作名称
	 * @access private
	 * @return string
	 */
	static private function getAction($var) {
		$action   = !empty($_POST[$var]) ?
		$_POST[$var] :
		(!empty($_GET[$var])?$_GET[$var]:C('DEFAULT_ACTION'));
		unset($_POST[$var],$_GET[$var]);
		define('P_ACTION_NAME',$action);
		return C('URL_CASE_INSENSITIVE')?strtolower($action):$action;
	}

	/**
	 * 获得实际的分组名称
	 * @access private
	 * @return string
	 */
	static private function getGroup($var) {
		$group   = (!empty($_GET[$var])?$_GET[$var]:C('DEFAULT_GROUP'));
		unset($_GET[$var]);
		return ucfirst(strtolower($group));
	}

}